dt-bindings: mfd: Document STPMIC1

STPMIC1 is a PMIC from STMicroelectronics. The STPMIC1 integrates 10
regulators, 3 power switches, a watchdog and an input for a power on key.
Signed-off-by: Pascal Paillet <p.paillet@st.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

Documentation/devicetree/bindings/mfd/st,stpmic1.txt

+* STMicroelectronics STPMIC1 Power Management IC
+
+Required properties:
+- compatible:		: "st,stpmic1"
+- reg:			: The I2C slave address for the STPMIC1 chip.
+- interrupts:		: The interrupt line the device is connected to.
+- #interrupt-cells:	: Should be 1.
+- interrupt-controller:	: Marks the device node as an interrupt controller.
+			    Interrupt numbers are defined at
+			    dt-bindings/mfd/st,stpmic1.h.
+
+STPMIC1 consists in a varied group of sub-devices.
+Each sub-device binding is be described in own documentation file.
+
+Device			 Description
+------			------------
+st,stpmic1-onkey	: Power on key, see ../input/st,stpmic1-onkey.txt
+st,stpmic1-regulators	: Regulators, see ../regulator/st,stpmic1-regulator.txt
+st,stpmic1-wdt		: Watchdog, see ../watchdog/st,stpmic1-wdt.txt
+
+Example:
+
+#include <dt-bindings/mfd/st,stpmic1.h>
+
+pmic: pmic@33 {
+	compatible = "st,stpmic1";
+	reg = <0x33>;
+	interrupt-parent = <&gpioa>;
+	interrupts = <0 2>;
+
+	interrupt-controller;
+	#interrupt-cells = <2>;
+
+	onkey {
+		compatible = "st,stpmic1-onkey";
+		interrupts = <IT_PONKEY_F 0>,<IT_PONKEY_R 1>;
+		interrupt-names = "onkey-falling", "onkey-rising";
+		power-off-time-sec = <10>;
+	};
+
+	watchdog {
+		compatible = "st,stpmic1-wdt";
+	};
+
+	regulators {
+		compatible = "st,stpmic1-regulators";
+
+		vdd_core: buck1 {
+			regulator-name = "vdd_core";
+			regulator-boot-on;
+			regulator-min-microvolt = <700000>;
+			regulator-max-microvolt = <1200000>;
+		};
+		vdd: buck3 {
+			regulator-name = "vdd";
+			regulator-min-microvolt = <3300000>;
+			regulator-max-microvolt = <3300000>;
+			regulator-boot-on;
+			regulator-pull-down;
+		};
+	};

include/dt-bindings/mfd/st,stpmic1.h

+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) STMicroelectronics 2018 - All Rights Reserved
+ * Author: Philippe Peurichard <philippe.peurichard@st.com>,
+ * Pascal Paillet <p.paillet@st.com> for STMicroelectronics.
+ */
+
+#ifndef __DT_BINDINGS_STPMIC1_H__
+#define __DT_BINDINGS_STPMIC1_H__
+
+/* IRQ definitions */
+#define IT_PONKEY_F	0
+#define IT_PONKEY_R	1
+#define IT_WAKEUP_F	2
+#define IT_WAKEUP_R	3
+#define IT_VBUS_OTG_F	4
+#define IT_VBUS_OTG_R	5
+#define IT_SWOUT_F	6
+#define IT_SWOUT_R	7
+
+#define IT_CURLIM_BUCK1	8
+#define IT_CURLIM_BUCK2	9
+#define IT_CURLIM_BUCK3	10
+#define IT_CURLIM_BUCK4	11
+#define IT_OCP_OTG	12
+#define IT_OCP_SWOUT	13
+#define IT_OCP_BOOST	14
+#define IT_OVP_BOOST	15
+
+#define IT_CURLIM_LDO1	16
+#define IT_CURLIM_LDO2	17
+#define IT_CURLIM_LDO3	18
+#define IT_CURLIM_LDO4	19
+#define IT_CURLIM_LDO5	20
+#define IT_CURLIM_LDO6	21
+#define IT_SHORT_SWOTG	22
+#define IT_SHORT_SWOUT	23
+
+#define IT_TWARN_F	24
+#define IT_TWARN_R	25
+#define IT_VINLOW_F	26
+#define IT_VINLOW_R	27
+#define IT_SWIN_F	30
+#define IT_SWIN_R	31
+
+/* BUCK MODES definitions */
+#define STPMIC1_BUCK_MODE_NORMAL 0
+#define STPMIC1_BUCK_MODE_LP 2
+
+#endif /* __DT_BINDINGS_STPMIC1_H__ */